From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2BB7C4332F for ; Wed, 2 Feb 2022 17:03:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346081AbiBBRDe (ORCPT ); Wed, 2 Feb 2022 12:03:34 -0500 Received: from mail-mw2nam10on2054.outbound.protection.outlook.com ([40.107.94.54]:63585 "EHLO NAM10-MW2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230295AbiBBRDc (ORCPT ); Wed, 2 Feb 2022 12:03:32 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=cUXwt7pVf7/VQSOvglHhkmeyTD/RjyA7gA1ZjNQh3tJzV1G0v1YSQ+wgkyYuBgIduQSHVGsmihij43EMwmUUqpiNvE2XjyE980eaXoOaCw/avNBbKsH/lJvONQlxL6VI57M04k9lKOIheU+CWIS4jt8n7lZwcujpK9+4BEzaxGiDAAR+4DwQnwnZ5now9VBB6V0B2P5kPMcIbXHPUMYWz4CeFnhXkXKRyVAy+cAbFpFJZcZWcwjaqMNc3wN3iPtOiOSsOWi4fWRqbaViVafGpJSLdQ6/Dfb/ihAKIIiVvmhSA+9eqCAov2nxSclPFoJDgs3nLsRgB1dTwrvs+RT8OA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=epBc2tteNGh0vzlRLVshclqH8oMzjYABJhTAxoh1+sE=; b=CUhhfiu/ZLvvPbQJfNUni/jS+2XgKvxAPxucSOsPV3JvO7CKOgrouQckTrq6kbLi8TeXLviuQURO4ZCJEPI36rL/RcghaAD5WcROHs8b3bz7Hn/RLv3HIXDP1q8iQUrrJGlXNTkaEXAoXBbG4dR09gx4s4D/nxvVvRTMPlWmVHNBfjqMLaWD2hmFMVdbZEFDdPI3l8rXSzLLxjeFl1otPiiuTmV+TqA9x2gw+re5mX7T+tZ160zqW/ZNHI0+XFzF4ko+0kc7Uhx3lmsF21t6yXuzifWh94jP/W+rrTFCNyQ12wAPAXhzhBpT+o+qD5JB8eIrH8SZqFbFviCOIDsySA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=none; dmarc=none; dkim=none; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=epBc2tteNGh0vzlRLVshclqH8oMzjYABJhTAxoh1+sE=; b=nUJdkax0iXPc/RO6pw6XGTG498hA1K9NW8vc8fnc2Tcp1CpqN8xZbw/lcn+KxzG0AVVN/vRppZmthogsJIOrqMTmH7/UOS6l+pD5X44za0lMOmJx978EotZWL5n+/S4OR5JtNoHON7jaR/jLjLDaI0ELwkP+LZYGf+s6ishg4cYLW0dO/GXgbaFnR/WCik0FcgDkwTbh4y7Qlaz+P2viLyT63mJf2OzWSQCxrLW+1uyRjx4UPKd7vdFivahYtonRCq7xTUhcv3xpOua6dh0pxy6WEPbaJwAPkqxAdWk92ai2glO+E0ibhVv6BEJdHyHGNEv59BIO6cO0DY+DHaqilw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) by BN6PR12MB1266.namprd12.prod.outlook.com (2603:10b6:404:14::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4951.11; Wed, 2 Feb 2022 17:03:30 +0000 Received: from MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::e8f4:9793:da37:1bd3]) by MN2PR12MB4192.namprd12.prod.outlook.com ([fe80::e8f4:9793:da37:1bd3%4]) with mapi id 15.20.4951.012; Wed, 2 Feb 2022 17:03:30 +0000 Date: Wed, 2 Feb 2022 13:03:29 -0400 From: Jason Gunthorpe To: Shameerali Kolothum Thodi Cc: "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-crypto@vger.kernel.org" , "alex.williamson@redhat.com" , "mgurtovoy@nvidia.com" , Linuxarm , liulongfang , "Zengtao (B)" , yuzenghui , Jonathan Cameron , "Wangzhou (B)" Subject: Re: [RFC v2 0/4] vfio/hisilicon: add acc live migration driver Message-ID: <20220202170329.GV1786498@nvidia.com> References: <20210702095849.1610-1-shameerali.kolothum.thodi@huawei.com> <20220202131448.GA2538420@nvidia.com> <20220202153945.GT1786498@nvidia.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MN2PR17CA0015.namprd17.prod.outlook.com (2603:10b6:208:15e::28) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0e4b07c1-771c-44bf-e5f2-08d9e66df056 X-MS-TrafficTypeDiagnostic: BN6PR12MB1266:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: uMtE83WUgOxNF1eRxkc50/r3CXsT2CfXejOwT3Qouh8NH5K2GjGb/X8TCdnzoeb95ADncw1B3X2NrggOXvXjK1O9nMRk8wENmTv5P/kPM2Ci6f87HppUYCr2J65c/Od8pWRVZKtWaKMxjOO32GWNIY5nL5VPICTedQad1DzB+xCHiQCQklo1urfbWKwAf/bwQK18wPv7HD1wX7GRpNVx5T3wC70BYhoPlbx5QQFzLGZQVmbf1+GzT7X+Ee8ts3R/07DCw13yKcp34HsFMcxWZ+oL758pbe3auxBS/q0eT5Bo1DKsxw5whQtQf3HZFElBqXS/MNG1g6IxxXMX7RJJ81ghM59/XJLbaWQFbTE0Ldn6N+kwUz8WZhm77DWFzfZFdiC0PQ7kXtPAGZoyP5/NJzBHVm6HK264CZIkgDyWRtGRhnKgwWSbith5FGW7LG3Pjzz+mIeHzKUaRQZd/snFybIWqLoSzzyorhROiZ3YS9VxaQvPxr8XyyNL8WB5fHAL7IWXgYHarPlcCSZPkFm1XzH/GPDFvsyVeORAx0WNKXDn2E0DVRO6dFG1Zy+8U/p9OIYUPatk68lY1XENfCwpeJ8FzMzy9PslqlM6c8tK50gcdChnTIVgzwYLTATuHaszNYSCfmihTQ+kv5bUv+11/KGtaMWFjL9hB8U+NLY+bmzjAFx75VlGJB9Ti+c2KLIJ7GunVCfiw4BlxSO9HWNTEq4fVBpQV0hg2XQ5Wxa265s= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB4192.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(6506007)(8676002)(8936002)(6512007)(33656002)(4326008)(508600001)(66946007)(26005)(6916009)(316002)(66476007)(54906003)(66556008)(186003)(966005)(6486002)(86362001)(1076003)(2906002)(5660300002)(38100700002)(7416002)(2616005)(36756003)(53546011);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?P7M0ncOeA70D4lK72BS4NK1NDq0iN0drfN94af/uxa2YOAxm/+Bz5fLQWpg1?= =?us-ascii?Q?uKw8KrbCiA4OotQtDE3SMKMb7WTJBMEYJS1c8icneLMu6xVAz7i6utkIi3KR?= =?us-ascii?Q?yj7EHfSVMto3AlcS7h+Br6P0Q1BdsgHJemOsv69vkG1j3NYM8t4JWePFK998?= =?us-ascii?Q?VpYDyEh9NB28qEUPSsIr3+j7sxj3v5bR5p77vUCek4eHOhl0kJZub6KdCmPh?= =?us-ascii?Q?l0bSNY/Gn5Tv2OodDXHH6X05bAun3RVL+sfVKMsDjOv0J5KcIqwT9pNdVaNE?= =?us-ascii?Q?oCcunbj7kPU5AQqzTMVjqI9XO0heHiKEZBPN1AVK8nMxAA+3NTVT13kQEEK0?= =?us-ascii?Q?rNc3ljJIkIdMJvS6SIdjrllU6ME0wvuvId11oaECQyzDcK/ECM0ZeijIQ3Yz?= =?us-ascii?Q?DST/oSROfd7yhQv3+luyxQGBtpfckltrXx/bV9EbZDQGpZKRS9D2DULsP06D?= =?us-ascii?Q?pE+LqM9hzFhIzbkPOAAfFteVBZOkPdyDTHPso6LlH7ZHxhqqCTLwr4OCCgBo?= =?us-ascii?Q?u9Cq7sbBpkSusU75UhxIcz6Il5alN0uoKaVeoSo9Fswr7Wq9fqTHuF/sAhkd?= =?us-ascii?Q?tY6NTfGmpeZIk+V38U5uQAe1HNfB4/KIl/vYqUxytpu2vq4MEo/ND17Ioi63?= =?us-ascii?Q?gxpOVmy+Cp5cltSwKVbbkqnaOh/5yeCFUTBTyIpIzrNmBNFWL5WaPrUbpgfr?= =?us-ascii?Q?YGVm52YJg2kInxj3/gpd2vX5BChje3l7grBPM7afHdukIAVf6vCvM5YBc8Lh?= =?us-ascii?Q?y0sXkCJlgG3uAshs3yrf8GIKz+7ePhSCzdJiP/OVAeriF2MypWDGOA1yQHsH?= =?us-ascii?Q?wtRK9CWigROaUdc1ySxi5rjrFLqw5T1RXPY1PPVNM505PPUeCYXOLMSuTYjh?= =?us-ascii?Q?4RdKxfUoE/2OHZogULTrmx2mr9qaG/GjsWKto3ZHg/PNNpNRU7ZqMQbx0Osm?= =?us-ascii?Q?ZCkdAXcoDczR5TC20xWHTCqkLeNQGB1Y2LpMh043+lwwdQ3dI6o13+JAK4tB?= =?us-ascii?Q?EnX9QSvpgx2GN9SGMU2wVaZ8PKYUhcOKUvX7+i1y9TpdqE0dkaofoJ7KN63F?= =?us-ascii?Q?xVRCaHaafMsqjq+3I3O/b/LfQRi8lihzd+sysXPe94YR9y0fOaJbNb2XR7YI?= =?us-ascii?Q?uhkx26B5xNfmsdq299P5D+Er7Ftrdd6JviRbsssa6PxtCDURC0EqpekGdeFS?= =?us-ascii?Q?1NJl6LBEgurVgJkWjaOdJWIuDpE7H1iU953qVGVF9Uh2RHWwAbWrVdAvnBrs?= =?us-ascii?Q?5DYx3OHUfOEpZv+6Ffj39GLbVUd5VFor0hLLpufy1taz3cjMBBSY2a6Dsdvy?= =?us-ascii?Q?a5CRElBNpGYCu3nd4zFaqMZUwG/x8sWwo9rhA1ighzSz9aZrKlFJ160Qt0X4?= =?us-ascii?Q?rso1lx/HXUsiUrJjWBx3OrHXIsFIQyjIJoWLuF/1M+XZ+CkgfXVcOFn7yT7v?= =?us-ascii?Q?/6lJxkl2gmNRZOYnEQVnQ+mtt8dLxDKxn58vs1ZRWFECQwE1+SjjeT4ySvDO?= =?us-ascii?Q?MVnCW0ymiX2fAyTUW327f8fwu5nBfcTTHWkcxEN0ZQ5g+8l9MFkMRF8XQDXM?= =?us-ascii?Q?pwHr+x/IWHz0BooPhYA=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0e4b07c1-771c-44bf-e5f2-08d9e66df056 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2022 17:03:30.8623 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: viesGuCtsMA005hdNLhoSbxV3LaezBdId+bdsonbnW/CLn8if/mi/DeeBlQjD46b X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR12MB1266 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 02, 2022 at 04:10:06PM +0000, Shameerali Kolothum Thodi wrote: > > > > From: Jason Gunthorpe [mailto:jgg@nvidia.com] > > Sent: 02 February 2022 15:40 > > To: Shameerali Kolothum Thodi > > Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org; > > linux-crypto@vger.kernel.org; alex.williamson@redhat.com; > > mgurtovoy@nvidia.com; Linuxarm ; liulongfang > > ; Zengtao (B) ; > > yuzenghui ; Jonathan Cameron > > ; Wangzhou (B) > > Subject: Re: [RFC v2 0/4] vfio/hisilicon: add acc live migration driver > > > > On Wed, Feb 02, 2022 at 02:34:52PM +0000, Shameerali Kolothum Thodi > > wrote: > > > > > > There are few topics to consider: > > > > - Which of the three feature sets (STOP_COPY, P2P and PRECOPY) make > > > > sense for this driver? > > > > > > I think it will be STOP_COPY only for now. We might have PRECOPY > > > feature once we have the SMMUv3 HTTU support in future. > > > > HTTU is the dirty tracking feature? To be clear VFIO migration support for > > PRECOPY has nothing to do with IOMMU based dirty page tracking. > > Yes, it is based on the IOMMU hardware dirty bit management support. > A RFC was posted sometime back, > https://lore.kernel.org/kvm/20210507103608.39440-1-zhukeqian1@huawei.com/ Yes, I saw that. I was hoping to have a discussion on this soon about how to integrate that with the iommufd work, which I hope will allow that series, and the other IOMMU drivers that can support this to be merged.. Jason